This POST endpoint is used to validate a bank account against MassPay's account verification providers, independently of a payout.
The bank account is validated for the user identified by user_token in the path, and the account holder name on record for that user is used for name matching.
If a finalized result is available within ~5 seconds (including cached results), it is returned synchronously with HTTP 200. Otherwise HTTP 202 is returned with a status of PROCESSING and the finalized result is delivered asynchronously through the avs.completed webhook event.
Validations are charged per validation based on your client pricing configuration; validations that cannot be verified by any provider (UNSUPPORTED) are not charged.